The Muslim population in Europe is expected to grow from 43.5 million in 2010 to 70.9 million in 2050, a sharp 63% increase. By 2050, one out of every ten Europeans will be a Muslim (if projections hold true). Given notably higher total fertility rates, the Muslims of Europe will generally be younger than their nonMuslim European counterparts.Recalling massacres committed by Islamic jihadis in France in 2015, and killings elsewhere in the past dozen years in Spain, the United Kingdom, Holland, and elsewhere, we can debate the question: "Will the growth of the Muslim population in Europe coincide with frequently more deadly clashes with the nonMuslim majority?​